Setting up contractor/business accounts with commercial suppliers is always a good idea since it often provides benefits like better pricing, free or low cost delivery and easy use of things like tax exemption authorization when applicable, etc. Many suppliers have no issue with "small volume" businesses, including part-time hobby businesses, at this point...every dollar coming in the door helps them. Getting to know others in your area who are makers and buy from certain suppliers is a good idea, too, as there are sometimes volume discounts that can be had when buying collectively. (Obviously, you have to work out the financial details of that to mutual agreement)
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The most expensive tool is the one you buy "cheaply" and often...